Computer randomly shut down, won't boot back up

I was on the internet, and talking to a friend on skype when my computer just shut off. When i tried to power it back on it did not respond, i unplugged the power supply, and replugged it, and when i tried to turn it back on i see the fans rotate a little, the the computer shuts back off. it is not even booting up. please help me.

the computer is a custom built computer that i built about 2 months ago. it was my first build.
intell core i7 2600k processor
asus p8p67 pro (REV 3.0) motherboard
8 gb of ddr3 ram
 
Back